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Date: Wed, 6 Jul 2011 16:44:47 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Mel Gorman <mgorman@suse.de>
Cc: Linux-MM <linux-mm@kvack.org>, Linux-Netdev <netdev@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        David Miller <davem@davemloft.net>, Neil Brown <neilb@suse.de>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: Re: [PATCH 01/14] mm: Serialize access to min_free_kbytes
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On Mon, 20 Jun 2011 14:12:07 +0100
Mel Gorman <mgorman@suse.de> wrote:

> There is a race between the min_free_kbytes sysctl, memory hotplug
> and transparent hugepage support enablement.  Memory hotplug uses a
> zonelists_mutex to avoid a race when building zonelists. Reuse it to
> serialise watermark updates.

This patch appears to be a standalone fix, unrelated to the overall
patch series?

How does one trigger the race and what happens when it hits, btw?